Struct CastError 

pub struct CastError<'a, 'py> {
    from: Borrowed<'a, 'py, PyAny>,
    classinfo: Bound<'py, PyAny>,
}

Error that indicates an object was not an instance of a given target type.

Fields

from: Borrowed<'a, 'py, PyAny>

The original object that failed the isinstance check.

classinfo: Bound<'py, PyAny>

The type we tried (and failed) to convert to. (see PyTypeCheck::classinfo_object)

Implementations

impl<'a, 'py> CastError<'a, 'py>

pub fn new(from: Borrowed<'a, 'py, PyAny>, classinfo: Bound<'py, PyAny>) -> Self

Create a new CastError representing a failure to interpret a smart pointer to from as a type from the given classinfo.

As with PyTypeCheck::classinfo_object, valid classinfo values are those which can be used with isinstance, such as type objects, tuples of type objects, or typing.Union instances.

Trait Implementations

impl<'a, 'py> Debug for CastError<'a, 'py>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for CastError<'_, '_>

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Error for CastError<'_, '_>

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

#[doc(hidden)]

fn type_id(&self, _: Internal) -> TypeId

where Self: 'static,

🔬This is a nightly-only experimental API. (error_type_id)

Gets the TypeId of self.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<CastError<'_, '_>> for PyErr

Convert CastError to Python TypeError.

fn from(err: CastError<'_, '_>) -> PyErr

Converts to this type from the input type.